...but this site sells parts and this is what was listed for MF 240:
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Alternator, Lucas - 12 volt, 35 amp. For Models: 20D, 20E, 240, 250, 270, 283, 290, 298, 30E. (Part No: 1897264M91) $103.62
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Alternator - 12 volt, 34 amp. For Models: (240 1983-99 w 152 dsl), (243 1999-00), (250 1983-86 w 152 dsl), (253 1988-99 w 152 dsl), (254 1982-87 w 152 dsl), (163T 1993-on), (270 1983-86 w 236 dsl), (290 1983-86 w 248 dsl), (670 1983-86 w 236 dsl), (690 1983-86 w 248 dsl), (698, 698T 1983-86 w 318 dsl). Replaces 24087. (Part No: ALU0023) $96.46
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Alternator - 12 volt, 45 amp. For Models: (240 sn A20286 and up), 243, 253, 283, 254-4, 263, 360, (365 sn up to 18009 wout cab), (375, 390, sn B18009 and up), (375, 390 Footstep tractor sn A29151 and up), (390T Footstep tractor), 394S, 383, 398, (393, 4225, 4233, 4235, 4240, 4243, 4245, 4253, 4255, 4265 wout cab). (Part No: 3698016M91) $105.53
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Alternator - 12 volt, 55 amp. For Models: (154 1986-89), (184 1986-89 w 236 dsl), (194, 194-4 1993 on), (240 1983-99 w 152 dsl), (243 1999-00), (245 1977-82 w 152 dsl), (250 1983-86 w 152 dsl), (253 1988-99 w 152 dsl), (254 1982-87 w 152 dsl), (255 1977-82 w 236 dsl), (260, 263T 1993 on), (300 1987-on), (360 1986-92 w 152 dsl), (364 1989-93 w 152 dsl), (365 1990-96), (373 1990-96), (374 1989-99 w 236 dsl), (375 1986-98 w 236 dsl), (377 1987-96), (383 1986-89 w 248 dsl), (384 1989-92 w 236 dsl), (387 1987-92), (390 1993-98 w 248 dsl), (390 1987-92 w 248 dsl), (390T 1989-98 w 236 dsl), (393 1992-94 w 236 dsl), (394 1989-93 w 248 dsl), (396 1992-98), (397, 397T 1989-96), (398 1987-97 w 236 dsl), (399 1987-98 w 354 dsl), (699 1984-86 w 354 dsl). Replaces 24157. (Part No: ALU0024) $112.33
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Alternator - 12 volt, 65 amp. For Models: (240 1983-99 w 152 dsl), (360 1986-92 w 152 dsl), (362 1990-92 w 236 dsl), (365 1990-96), (368 1986-92 w 236 dsl), (375 1986-98 w 236 dsl), (383 1986-98 w 248 dsl), (390 1987-98 w 248 dsl), (390T 1989-98 w 236 dsl), (393 1995-98 w 236 dsl), (396 1992-98), (398 1987-97), (399 1987-92 w 354 dsl), (4225, 4233, 4235, 4243, 4245, 4253, 4255, 4260, 4263, 4270 1997-00 w 1004.4 dsl). Replaces 24199, 24294. (Part No: ALU0010) $112.33
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Alternator - Don't see the Alternator you need for your tractor? We have many alternators not listed on this website (for tractors 1953 & newer). Just call us at 800-853-2651. (Part No: ALTERNATOR) $0.00
-->Look in the upper left of this page and click on TRACTOR PARTS.
